Improvement in bolts for doors



. ARNOLD.

Bolts for Doors.

Pat entedApril29,1873.

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STEPHEN 1). ARNOLD, on NEW BRITAIN, CONNECTICUT, ssreNoE o P. OORBIN ANDE. OORBIN, 0E sAME PLAC IMPROVEMENT IN BOLTS FOR DOORS.

Specification forming part of Letters Patent N0. 138,360., dated April29, 1873; application filed April 12, 1873.

To all whom it may concern:

Be it known that I, STEPHEN D. ARNOLD, of New Britain, in the county ofHartford and State of Connecticut, have invented an Improvement in Boltsfor Doors, of which the following is a specification:

The object of this invention is to secure the bolt when projected, andavoid the friction that is usually applied to a bolt to prevent the samefalling or being shaken or moved by efforts to open the door fromoutside.

, I make use of a spring-dog hinged to the bolt-stock, and operated by apin passing through the knob, so that the bolt is held by the dog whenprojected, and the dog is selfacting in holding the bolt projected, butslides when the bolt is' being moved.

In the drawing, Figure 1 is a vertical section with the bolt projected,and the positions of the parts when the bolt is retracted are shown bydotted lines; and Fig. 2 is arear elevation.

The plate a of the bolt is of usual size and character, and b is thebolt united to the boltstock a that slides in a mortise in said plate a.dis the knob to operate said bolt, and f is a o is a push-pin by whichthe lower end 2 of the dog can be pushed out of the mortise in the platea, but when the bolt is projected said dog is made to hold the same bythe spring 1" throwing the end 2 of said dog into the mortise.

The push-pin 0 passes through the stock 0 and knob d, and there is aspring, 8, between the stock 0 and the enlarged end of the pin 0 to keepsaid pin clear of the dog f.

When this improvement is used upon a bolt for the bottom of the doorthere may be a spring around the bolt 1) to throw the same up when thedog f is pushed back.

I claim as my invention- The dog f, hinged to the stock 0 of the bolt,in combination with the spring r and the pushpin 0 that passes throughthe knob d, as and for the purposes set forth.

Signed by me this 4th day of April, A. D. 18.73.

S. D. ARNOLD Witnesses:

OHAELEs PECK, JOHN R. SLoANE.

